On mongoengine ValidationError return the error dict
handle empty uri params
handle_serialization_error so that a single serialization error in a List method doesn't break the whole response
Move handle_serialization_error to Resource
better check of fixed_obj in handle_serialization_error
Merge pull request #57 from elasticsales/handle_serialization_error

handle_serialization_error so that a single serialization error in a List method doesn't break the whole response
Merge branch 'master' of github.com:elasticsales/flask-mongorest